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PIC16F628A Comparator mode

 
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2-Chri



Joined: 23 Mar 2012
Posts: 8

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PIC16F628A Comparator mode
PostPosted: Sat Apr 28, 2012 11:53 am     Reply with quote
Hello,
I want to use C2 comparator of PIC16F628A. Please could anyone to explain me the two below commands. Pin RA2 has a stable voltage at 2,5V (Vref) and pin RA1 is my analog input. The pins RA0 and RA3 I used as digital inputs. What means VR? Thanks.
Code:

setup_comparator(A0_VR_A1_VR);

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http://i46.tinypic.com/5oa2qb.png

dyeatman



Joined: 06 Sep 2003
Posts: 1934
Location: Norman, OK

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PostPosted: Sat Apr 28, 2012 12:47 pm     Reply with quote
VR means voltage reference. Section 11 of the datasheet gives a full
description of the internal Voltage Reference module. See 10.3.2 and figures
11-1 and 11-2. Also note in 11.2 that internal VRef is affected by changes in
VDD which affects accuracy.
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2-Chri



Joined: 23 Mar 2012
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PostPosted: Sun Apr 29, 2012 10:48 am     Reply with quote
I write the below command and works perfect.
Code:

setup_comparator(NC_NC_A1_A2); // Turn on Comparator C2.

Comparator C1 is not used.

Thanks for your answer.
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